Improvement in treadle apparatus for



L. STERNBERGER. Treadle Apparatus for Applying Power to Sewing- Machine.

No. 203,791. Patehteql May 14, 1878 UNITED STATES PATENT OFFICE.

LEOPOLD STERNBERGER, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN TREADL'E APPARATUS FOR APPLYING POWER TO SEWlNG-MACHlNES.

Specification forming part of Letters Patent No. 203,791, dated May 14, 1878 application filed April 22, 1878.

To all whom/"it may concern:

Beitknownthat I, LEOPOLD STERNBERGER,

' of Philadelphia, Pennsylvania, have invented a new and useful Improvement in Power- Driven Sewing-Machines, of which the followin g is a specification:

The object of my invention is to construct and apply to a sewing-machine mechanism for driving the same by power in such a manner that the parts of the sewing-machine need not be altered in any respect-an object which 7 I attain in the following manner, reference being had to the accompanying drawing, in which-- Figure l is a perspective view illustrating the mode of carrying out my invention, and Figs. 2 and 3 detached views of parts of the same.

A is a longitudinal power-driven shaft, ar-

ranged preferably between two parallel rows of sewing-machines which are to be driven by said shaft. On this shaft, adjacent to each machine, is secured a collar, a, and on the shaft adjacent to this collar is arranged to' slide a loose disk, I),- faced with leather, cork,- or similar material, and having a projection, d, to a groove, in which is adapted a ring, 0, carried by a forked arm, f, which projects from one end of a rock-shaft, B, the latter being adapted to bearings g on the floor, and having at or near its opposite end an arm, h, connected at the outer end by means of a link, i, with the slotted projection j, with which the front end of the treadle D is provided, and

to which the lower end of the pitman is usu-.

ally connected.

It will be seen that the collar to forms a To a bearing on the under side of the table, a

in line with the fly-wheel J, is hung a brake, s, which is connected with the inner end of the treadle D by means of an arm, to, the latter, by preference, being so constructed that it can be readily shortened, so as to compenstate for the loss caused by the wearing of the brake s.

The operation of the devices is as follows: A

When it is desired to start the machine the outer end of the treadle D is depressed, so as to operate the rock-shaft B and throw the disk 12 into frictional contact with the collar a, the rotary motion of which is thus imparted to the disk, and by it to the shaft F. The

same movement of the treadle which eifected this operation raised the brake s from the surface of the wheel J, so that the latter was free to revolve.

A reverse movement of the treadle D withdraws the disk b from contact with the col' lar a and causes the brake to be brought into contact with the periphery of the wheel J, so as to effect the instant stoppage of the machine.

I wish it to be understood thatI do not desire to claim, broadly, the starting and stopping of the machine and the application. of the brake by means of a movement of the treadle, as I am aware that various combinations of devices have been hitherto employed by which this result has been accomplished. Therefore I claim as my invention-- 1. The combination of sewingmachine shaft F, having pulleys m and n and fly-wheel J, the driving-shaft A, having the fixed collar a and loose disk b, the rock-shaft B, having :In testimony whereof I have signed my arms f and h, the treadle D, the brake s, and name to this specification in the presence of the rod w, all constructed, arranged and optwo subscribing Witnesses.

crating substantially as and for the purpose herein set forth.

2. The combination of the shaft A, its collar a and disk I), the treadle D, and the rockshaft B, with its forked arm f and adjustable arm h, as set forth.

LEOPOLD STERNBERGER.

Witnesses:

HARRY A. CRAWFORD, HARRY SMITH. 

